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AUSCERT External Security Bulletin Redistribution
ESB-2019.2988
Multiple vulnerabilities have been identified in Cisco
Adaptive Security Appliance
8 August 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Adaptive Security Appliance
Publisher: Cisco Systems
Operating System: Cisco
Virtualisation
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1945 CVE-2019-1944 CVE-2019-1934
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-asa-privescala
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-asa-multi
Comment: This bulletin contains two (2) Cisco Systems security advisories.
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Cisco Adaptive Security Appliance Software Web-Based Management Interface
Privilege Escalation Vulnerability
Priority: High
Advisory ID: cisco-sa-20190807-asa-privescala
First Published: 2019 August 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvp09150
CVE-2019-1934
CWE-285
CVSS Score:
8.8 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the web-based management interface of Cisco Adaptive
Security Appliance (ASA) Software could allow an authenticated, remote
attacker to elevate privileges and execute administrative functions on an
affected device.
The vulnerability is due to insufficient authorization validation. An
attacker could exploit this vulnerability by logging in to an affected
device as a low-privileged user and then sending specific HTTPS requests to
execute administrative functions using the information retrieved during
initial login.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-asa-privescala
Affected Products
o Vulnerable Products
This vulnerability affects Cisco products that are running Cisco ASA
Software releases 8.2 and later and that have web management access
enabled.
Determining Whether Web Management Access Is Configured
Administrators can use the show running-config http command to determine
whether web management is enabled. The following example shows the output
of the command for a device that has the web management feature enabled and
that allows access to the web management feature from the 10.10.10.0/24
network via the Management interface:
ciscoasa# show running-config http
http server enable
http 10.10.10.0 255.255.255.0 Management
Note: The device is vulnerable to requests only when they are sent from an
IP address in the range configured in the http <remote_ip_address>
<remote_subnet_mask> <interface_name> command.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Firepower
Threat Defense (FTD) Software.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page , to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC:
https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Customers are advised to upgrade to an appropriate fixed software release
as indicated in the following table:
Cisco ASA Software Release First Fixed Release
Earlier than 9.4 ^1 9.4.4.37
9.4 9.4.4.37
9.5 ^1 9.6.4.30
9.6 9.6.4.30
9.7 ^1 9.8.4.7
9.8 9.8.4.7
9.9 9.9.2.50
9.10 9.10.1.22
9.12 9.12.2
^ 1 Cisco ASA Software releases earlier than Release 9.4, and Cisco ASA
Software releases 9.5 and 9.7, have reached end of maintenance. Customers
should migrate to a supported release that includes the fix for this
vulnerability.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o Cisco would like to thank Qian Chen of the Qihoo 360 Nirvan Team for
reporting this vulnerability.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-asa-privescala
Revision History
o +---------+--------------------------+---------+--------+-----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+-----------------+
| 1.0 | Initial public release. | - | Final | 2019-August-07 |
+---------+--------------------------+---------+--------+-----------------+
- ---
Cisco Adaptive Security Appliance Smart Tunnel Vulnerabilities
Priority: Medium
Advisory ID: cisco-sa-20190807-asa-multi
First Published: 2019 August 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvo78789
CVE-2019-1944
CVE-2019-1945
CWE-20
CVSS Score:
6.7 AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o Multiple vulnerabilities in the smart tunnel functionality of Cisco
Adaptive Security Appliance (ASA) could allow an authenticated, local
attacker to elevate privileges to the root user or load a malicious library
file while the tunnel is being established.
For more information about these vulnerabilities, see the Details section
of this security advisory.
Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-asa-multi
Affected Products
o Vulnerable Products
These vulnerabilities affect Cisco ASA Software.
For information about which Cisco ASA Software releases are vulnerable, see
the Fixed Software section of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by these vulnerabilities.
Details
o Two vulnerabilities in the smart tunnel functionality of Cisco ASA could
allow an authenticated, local attacker to elevate privileges to the root
user or load a malicious library file during execution.
The vulnerabilities are not dependent on one another; exploitation of one
of the vulnerabilities is not required to exploit the other vulnerability.
In addition, a software release that is affected by one of the
vulnerabilities may not be affected by the other vulnerability.
Details about the vulnerabilities are as follows.
Cisco Adaptive Security Appliance Smart Tunnel Privilege Escalation
Vulnerability
A vulnerability in the smart tunnel functionality of Cisco ASA could allow
an authenticated, local attacker to elevate privileges to the root user.
This privilege escalation happens on a client device that attempts to
establish a smart tunnel connection with the Cisco ASA. The escalation does
not occur on the ASA itself.
The vulnerability occurs because the Cisco ASA smart tunnel creates local
system files on the client device with file permissions that are not
restrictive enough. In addition, the ASA smart tunnel does not validate the
system commands in these local system files before executing them. An
attacker could exploit this vulnerability by running a malicious script on
the client device when a valid user is establishing the Cisco ASA smart
tunnel connection. A successful exploit could allow the attacker to elevate
privileges to root on the client machine without the user's knowledge. The
attacker needs valid device credentials on the local client device to
exploit this vulnerability.
The CVE ID for this vulnerability is: CVE-2019-1944
Cisco Adaptive Security Appliance Smart Tunnel Library File Load
Vulnerability
A vulnerability in the smart tunnel functionality of Cisco ASA could allow
an authenticated, local attacker to overwrite specific system files, which
could then be loaded and executed during smart tunnel connection
establishment. The attacker could take these actions on the client device
that is attempting to establish the smart tunnel connection with the Cisco
ASA and not on the ASA itself.
The vulnerability occurs because the Cisco ASA can write files to specific
locations on the file system, and the smart tunnel functionality does not
validate the integrity of system files that load during execution. An
attacker could exploit this vulnerability by creating a malicious system
file and writing it to a specific location on the file system when a valid
user is establishing the Cisco ASA smart tunnel connection. A successful
exploit could allow the attacker to cause the smart tunnel to load a
malicious executable. The attacker needs valid device credentials on the
local client device to exploit this vulnerability.
The CVE ID for this vulnerability is: CVE-2019-1945
Workarounds
o There are no workarounds that address these vulnerabilities.
Fixed Software
o Cisco has released free software updates that address the vulnerabilities
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license: https://www.cisco.com/c/en/us/products/
end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page , to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC:
https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Customers are advised to upgrade to an appropriate release as indicated in
the applicable table in this section. In the following table(s), the left
column lists Cisco software releases and the right column indicates whether
a release is affected by the vulnerabilities described in this advisory and
the release that includes the fix for these vulnerabilities.
Cisco ASA Software
Cisco ASA Software Release First Fixed Release for These Vulnerabilities
Earlier than 9.4 ^1 9.4.4.37
9.4 9.4.4.37
9.5 ^1 9.8.4.7
9.6 9.8.4.7
9.7 ^1 9.8.4.7
9.8 9.8.4.7
9.9 9.10.1.22
9.10 9.10.1.22
9.12 9.12.2.1
1. Cisco ASA Software releases earlier than Release 9.4 and Cisco ASA
Software Releases 9.5 and 9.7 have reached end of maintenance. Customers
should migrate to a supported release that includes the fix for these
vulnerabilities.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerabilities that are
described in this advisory.
Source
o Cisco would like to thank Francesco Giordano of Hacktive Security for
reporting these vulnerabilities.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-asa-multi
Revision History
o +---------+--------------------------+---------+--------+-----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+-----------------+
| 1.0 | Initial public release. | - | Final | 2019-August-07 |
+---------+--------------------------+---------+--------+-----------------+
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